Chain Season Has Officially Commenced in Colorado Every year, September 1st marks the beginning of chain season in Coloradoโs I-70 corridor. By the time that September comes around, Coloradoโs weather patterns become completely unpredictable, and mountain travelers on I-70 need to be fully prepared to deal with adverse conditions. Related: What You Need To Know About Coloradoโs New I-70 Traction Law In the winter, on Coloradoโs I-70, [โฆ] Brains Jesse | September 2, 2021 3 Comments